add support dns.he.net

README.md

@@ -249,11 +249,14 @@ Example usage in cron with Python:
 ```shell
 # at 00:00 on Monday
 0 0 * * 1 /usr/bin/python3 ~/simplewc.py --domain EXAMPLE.COM --server 8.8.8.8 --keyname KEY --keydata YOU_KEY_CONTENT > /dev/null
+# 00:00 on day-of-month 1 and 15
+0 0 1,15 * * /usr/bin/python3 ~/simplewc.py --domain EXAMPLE.COM --server dyn.dns.he.net --keyname - --keydata YOU_DDNSKEY > /dev/null
 ```
 Example usage in terminal with make the script executable:  
 ```shell
 chmod u+x ./simplewc.py
 ./simplewc.py --domain EXAMPLE.COM --server 8.8.8.8 --keyname KEY --keydata YOU_KEY_CONTENT --test --force
+./simplewc.py --domain EXAMPLE.COM --server dyn.dns.he.net --keyname - --keydata YOU_DDNSKEY --test --force
 ```
 
 ____

simplewc.py

@@ -6,6 +6,7 @@ from shutil import make_archive
 from subprocess import Popen, PIPE, STDOUT
 from time import sleep
 from typing import Union
+import urllib.request
 try:
     from dns import resolver, rdatatype, rdataclass, rdata, update, query, tsigkeyring, tsig, name
 except ModuleNotFoundError:
@@ -66,6 +67,35 @@ class NSupdate:
         return query.tcp(q=rec_upd, where=self._server)
 
 
+class HEupdate:
+    """
+    Dynamic DNS update on dyn.dns.he.net from Python
+    """
+    def __init__(self, ddnskey: str, server: str = 'https://dyn.dns.he.net/nic/update') -> None:
+        """
+        Object constructor
+        :param ddnskey: string with content of the key (password) to update the record
+        :param server: string with server for dynamic update request        
+        """
+        self._server = server
+        self._ddnskey = ddnskey
+
+    def rec_add(self, rec_key: str, rec_val: str) -> None:
+        """
+        Change record data from DNS zone
+        :param rec_key: string with record fqdn
+        :param rec_val: string with record value
+        :return: None, Message after request
+        """
+        self._data = 'hostname=' + rec_key + '&' + 'password=' + self._ddnskey + '&' + 'txt=' + rec_val
+        request = urllib.request.Request(url=self._server, data=bytes(self._data.encode('utf-8')), method='POST')
+        response = urllib.request.urlopen(request).read()
+        if response.startswith(b'\xff\xd8'):
+            return response
+        else:
+            return str(response.decode('utf-8'))
+
+
 class ACMEcert:
     """
     ACME launcher for DNS-01 challenge from Python
@@ -166,7 +196,10 @@ if __name__ == "__main__":
         cer_test = True
 
     cer = ACMEcert(zone=args['domain'], acme_path=args['acmepath'], force=cer_force, test=cer_test)
-    dns = NSupdate(zone=args['domain'], server=args['server'], keyname=args['keyname'], keydata=args['keydata'])
+    if 'dns.he.net' in args['server']:
+        dns = HEupdate(ddnskey=args['keydata'])
+    else:
+        dns = NSupdate(zone=args['domain'], server=args['server'], keyname=args['keyname'], keydata=args['keydata'])
 
     attempts_pass, attempts_wait = 0, 60
     while attempts_pass < 2: